This study aims to investigate the chemical structure and morphology of plasmapolymers produced by deposition of ethylene on the surface of polypropylene. The deposition films（sediments） of ethylene plasma on the su...This study aims to investigate the chemical structure and morphology of plasmapolymers produced by deposition of ethylene on the surface of polypropylene. The deposition films（sediments） of ethylene plasma on the surface of polypropylene are nonuniform, and the characterization results indicate the existence of hydroxyl groups and aldehyde（or ketone） groups in the sediments. The sediment of ethylene plasma on the polypropylene surface could induce the growth of β-form crystals in the surface layer of polypropylene.展开更多
目的:探讨转录因子腺病毒E4启动子结合蛋白(adenovirus E4 promoter-binding protein,E4BP4)通过腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)-转化生长因子(transforming growth factor,TGF)-β1/SMAD...目的:探讨转录因子腺病毒E4启动子结合蛋白(adenovirus E4 promoter-binding protein,E4BP4)通过腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)-转化生长因子(transforming growth factor,TGF)-β1/SMAD同源物3(Smad homolog 3,SMAD3)通路在调控病理性心肌纤维化的作用。方法:建立小鼠心脏纤维化模型,分别于模型组和假手术组中检测E4BP4的表达差异。分离和培养原代心脏成纤维细胞,血管紧张素Ⅱ(angiotensin Ⅱ,Ang Ⅱ)刺激增殖活化,分别转染E4BP4过表达质粒(Ang Ⅱ+E4BP4组)、E4BP4干扰质粒(Ang Ⅱ+siE4BP4组)、Ang Ⅱ组和未经Ang Ⅱ处理的对照组。免疫荧光检测α-肌动蛋白(α-smooth muscle actin,α-SMA)荧光强度,细胞增殖检测试剂盒测定细胞活力,聚合酶链式反应检测E4BP4、α-SMA、Ⅰ型胶原蛋白(collagen type Ⅰ,Collagen Ⅰ)和Ⅲ型胶原蛋白(collagen type Ⅲ,Collagen Ⅲ)的表达,蛋白质印迹检测TGF-β1、AMPK和SMAD3的蛋白表达。结果:与假手术组比较,模型组心肌纤维化程度(38.46±1.21 vs. 3.39±0.39,t=-78.564,P=0.000)、E4BP4蛋白表达量(0.96±0.03 vs. 0.75±0.03,t=-11.480,P=0.000)均明显增加。体外实验发现,与Ang Ⅱ+E4BP4组比较,Ang Ⅱ+siE4BP4组在平均荧光强度(0.05±0.01 vs. 0.42±0.03,F=677.591,P=0.000)、细胞活力(91.30±2.39vs.123.74±2.60,F=132.696,P=0.000)、α-SMA(1.26±0.09vs.3.59±0.86,F=52.274,P=0.000)、Collagen Ⅰ(1.16±0.11vs.3.79±0.89,F=55.336,P=0.000)、Collagen Ⅲ(1.23±0.13 vs. 2.92±0.36,F=119.929,P=0.000)、TGF-β1(0.66±0.04 vs. 0.96±0.02,F=142.954,P=0.000)和p-SMAD3/SMAD3(0.81±0.03 vs. 1.37±0.02,F=739.609,P=0.000)的水平明显降低,而p-AMPK/AMPK的表达量在Ang Ⅱ+siE4BP4组明显高于Ang Ⅱ+E4BP4组(0.89±0.01 vs. 0.58±0.02,F=284.541,P=0.000)。结论:E4BP4是纤维化调控的关键因子,抑制其表达可通过激活AMPK进而抑制TGF-β1/SMAD3通路发挥抗纤维化作用。展开更多
For poly(9,9-dioctylfluorene)(PFO),β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favo...For poly(9,9-dioctylfluorene)(PFO),β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (DIO) is added to PFO o-xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing DIO concentration and reaches a platform of 39% as DIO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with oxylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.展开更多
Objectives: The aim of this study was to compare the efficacy of using the synthetic β-TCP bone grafting material in two different manufacturing forms (putty and granular) in grafting the jumping zone around immediat...Objectives: The aim of this study was to compare the efficacy of using the synthetic β-TCP bone grafting material in two different manufacturing forms (putty and granular) in grafting the jumping zone around immediate implant. Patients and Method: A randomized controlled clinical and radiographic trial was conducted on 24 male patients aged from 45 - 55 with badly decayed non-restorable teeth in the posterior mandibular area and seeking for receiving immediate dental implant directly after extraction. Vertical bone height and bone density were taken at time of implant placement and 6 months postoperatively. Results: The Putty form group and the Granular form group did not differ statistically in terms of age, post-operative complications, or implant outcome six months postoperatively. Additionally, there was a statistically significant increase in Putty form group compared to the Granular form group regarding Marginal bone loss 6 months postoperatively, but there was no statistically significant difference between the Putty form group and the Granular form group regarding Bone density by CBCT. Conclusion: The β-TCP Putty material, compared to β-TCP granular, displayed better surgical handling properties, and both forms had no adverse effect on bone formation, bone tissue maturation or graft volume stability, The β-TCP granular material, compared to β-TCP putty, displayed less marginal bone loss 6 months post-operatively.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51033004 and 51473113)the Natural Science Foundation of Tianjin(No.12JCYBJC11900)
文摘This study aims to investigate the chemical structure and morphology of plasmapolymers produced by deposition of ethylene on the surface of polypropylene. The deposition films（sediments） of ethylene plasma on the surface of polypropylene are nonuniform, and the characterization results indicate the existence of hydroxyl groups and aldehyde（or ketone） groups in the sediments. The sediment of ethylene plasma on the polypropylene surface could induce the growth of β-form crystals in the surface layer of polypropylene.
文摘目的:探讨转录因子腺病毒E4启动子结合蛋白(adenovirus E4 promoter-binding protein,E4BP4)通过腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)-转化生长因子(transforming growth factor,TGF)-β1/SMAD同源物3(Smad homolog 3,SMAD3)通路在调控病理性心肌纤维化的作用。方法:建立小鼠心脏纤维化模型,分别于模型组和假手术组中检测E4BP4的表达差异。分离和培养原代心脏成纤维细胞,血管紧张素Ⅱ(angiotensin Ⅱ,Ang Ⅱ)刺激增殖活化,分别转染E4BP4过表达质粒(Ang Ⅱ+E4BP4组)、E4BP4干扰质粒(Ang Ⅱ+siE4BP4组)、Ang Ⅱ组和未经Ang Ⅱ处理的对照组。免疫荧光检测α-肌动蛋白(α-smooth muscle actin,α-SMA)荧光强度,细胞增殖检测试剂盒测定细胞活力,聚合酶链式反应检测E4BP4、α-SMA、Ⅰ型胶原蛋白(collagen type Ⅰ,Collagen Ⅰ)和Ⅲ型胶原蛋白(collagen type Ⅲ,Collagen Ⅲ)的表达,蛋白质印迹检测TGF-β1、AMPK和SMAD3的蛋白表达。结果:与假手术组比较,模型组心肌纤维化程度(38.46±1.21 vs. 3.39±0.39,t=-78.564,P=0.000)、E4BP4蛋白表达量(0.96±0.03 vs. 0.75±0.03,t=-11.480,P=0.000)均明显增加。体外实验发现,与Ang Ⅱ+E4BP4组比较,Ang Ⅱ+siE4BP4组在平均荧光强度(0.05±0.01 vs. 0.42±0.03,F=677.591,P=0.000)、细胞活力(91.30±2.39vs.123.74±2.60,F=132.696,P=0.000)、α-SMA(1.26±0.09vs.3.59±0.86,F=52.274,P=0.000)、Collagen Ⅰ(1.16±0.11vs.3.79±0.89,F=55.336,P=0.000)、Collagen Ⅲ(1.23±0.13 vs. 2.92±0.36,F=119.929,P=0.000)、TGF-β1(0.66±0.04 vs. 0.96±0.02,F=142.954,P=0.000)和p-SMAD3/SMAD3(0.81±0.03 vs. 1.37±0.02,F=739.609,P=0.000)的水平明显降低,而p-AMPK/AMPK的表达量在Ang Ⅱ+siE4BP4组明显高于Ang Ⅱ+E4BP4组(0.89±0.01 vs. 0.58±0.02,F=284.541,P=0.000)。结论:E4BP4是纤维化调控的关键因子,抑制其表达可通过激活AMPK进而抑制TGF-β1/SMAD3通路发挥抗纤维化作用。
基金financially supported by the National Natural Science Foundation of China (Nos. 51890871, 91833306, and 51573185)the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB12020300)
文摘For poly(9,9-dioctylfluorene)(PFO),β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (DIO) is added to PFO o-xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing DIO concentration and reaches a platform of 39% as DIO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with oxylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.
文摘Objectives: The aim of this study was to compare the efficacy of using the synthetic β-TCP bone grafting material in two different manufacturing forms (putty and granular) in grafting the jumping zone around immediate implant. Patients and Method: A randomized controlled clinical and radiographic trial was conducted on 24 male patients aged from 45 - 55 with badly decayed non-restorable teeth in the posterior mandibular area and seeking for receiving immediate dental implant directly after extraction. Vertical bone height and bone density were taken at time of implant placement and 6 months postoperatively. Results: The Putty form group and the Granular form group did not differ statistically in terms of age, post-operative complications, or implant outcome six months postoperatively. Additionally, there was a statistically significant increase in Putty form group compared to the Granular form group regarding Marginal bone loss 6 months postoperatively, but there was no statistically significant difference between the Putty form group and the Granular form group regarding Bone density by CBCT. Conclusion: The β-TCP Putty material, compared to β-TCP granular, displayed better surgical handling properties, and both forms had no adverse effect on bone formation, bone tissue maturation or graft volume stability, The β-TCP granular material, compared to β-TCP putty, displayed less marginal bone loss 6 months post-operatively.
